libdecnumber/bid/decimal64.c

   1 /* Copyright (C) 2007
   2    Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 2, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING.  If not, write to the Free
  18 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301, USA.  */
  20
  21 /* As a special exception, if you link this library with other files,
  22    some of which are compiled with GCC, to produce an executable,
  23    this library does not by itself cause the resulting executable
  24    to be covered by the GNU General Public License.
  25    This exception does not however invalidate any other reasons why
  26    the executable file might be covered by the GNU General Public License.  */
  27
  28 #define decimal64FromString __dpd64FromString
  29 #define decimal64ToString __dpd64ToString
  30 #define decimal64ToEngString __dpd64ToEngString
  31 #define decimal64FromNumber __dpd64FromNumber
  32 #define decimal64ToNumber __dpd64ToNumber
  33
  34 #include "dpd/decimal64.c"
  35
  36 #undef decimal64FromString
  37 #undef decimal64ToString
  38 #undef decimal64ToEngString
  39 #undef decimal64FromNumber
  40 #undef decimal64ToNumber
  41
  42 #include "bid-dpd.h"
  43
  44 #ifdef IN_LIBGCC2
  45 #define decimal64FromString __decimal64FromString
  46 #define decimal64ToString __decimal64ToString
  47 #define decimal64ToEngString __decimal64ToEngString
  48 #define decimal64FromNumber __decimal64FromNumber
  49 #define decimal64ToNumber __decimal64ToNumber
  50 #endif
  51
  52 decimal64 *decimal64FromString (decimal64 *, const char *, decContext *);
  53 char *decimal64ToString (const decimal64 *, char *);
  54 char *decimal64ToEngString (const decimal64 *, char *);
  55 decimal64 *decimal64FromNumber (decimal64 *, const decNumber *, decContext *);
  56 decNumber *decimal64ToNumber (const decimal64 *, decNumber *);
  57
  58 void __host_to_ieee_64 (_Decimal64 in, decimal64 *out);
  59 void __ieee_to_host_64 (decimal64 in, _Decimal64 *out);
  60
  61 decimal64 *
  62 decimal64FromNumber (decimal64 *d64, const decNumber *dn,
  63                       decContext *set)
  64 {
  65   /* decimal64 and _Decimal64 are different types.  */
  66   union
  67     {
  68       _Decimal64 _Dec;
  69       decimal64 dec;
  70     } u;
  71
  72   __dpd64FromNumber (d64, dn, set);
  73
  74   /* __dpd64FromNumber returns in big endian. But _dpd_to_bid64 takes
  75      host endian. */
  76   __ieee_to_host_64 (*d64, &u._Dec);
  77
  78   /* Convert DPD to BID.  */
  79   _dpd_to_bid64 (&u._Dec, &u._Dec);
  80
  81   /* dfp.c is in bid endian. */
  82   __host_to_ieee_64 (u._Dec, &u.dec);
  83
  84   /* d64 is returned as a pointer to _Decimal64 here.  */
  85   *d64 = u.dec;
  86
  87   return d64;
  88 }
  89
  90 decNumber *
  91 decimal64ToNumber (const decimal64 *bid64, decNumber *dn)
  92 {
  93   /* decimal64 and _Decimal64 are different types.  */
  94   union
  95     {
  96       _Decimal64 _Dec;
  97       decimal64 dec;
  98     } u;
  99
 100   /* bid64 is a pointer to _Decimal64 in bid endian. But _bid_to_dpd64
 101      takes host endian.  */
 102   __ieee_to_host_64 (*bid64, &u._Dec);
 103
 104   /* Convert BID to DPD.  */
 105   _bid_to_dpd64 (&u._Dec, &u._Dec);
 106
 107   /* __dpd64ToNumber is in bid endian.  */
 108   __host_to_ieee_64 (u._Dec, &u.dec);
 109
 110   return __dpd64ToNumber (&u.dec, dn);
 111 }
 112
 113 char *
 114 decimal64ToString (const decimal64 *d64, char *string)
 115 {
 116   decNumber dn;                 /* work */
 117   decimal64ToNumber (d64, &dn);
 118   decNumberToString (&dn, string);
 119   return string;
 120 }
 121
 122 char *
 123 decimal64ToEngString (const decimal64 *d64, char *string)
 124 {
 125   decNumber dn;                 /* work */
 126   decimal64ToNumber (d64, &dn);
 127   decNumberToEngString (&dn, string);
 128   return string;
 129 }
 130
 131 decimal64 *
 132 decimal64FromString (decimal64 *result, const char *string,
 133                       decContext *set)
 134 {
 135   decContext dc;                /* work */
 136   decNumber dn;                 /* .. */
 137
 138   decContextDefault (&dc, DEC_INIT_DECIMAL64);  /* no traps, please */
 139   dc.round = set->round;        /* use supplied rounding */
 140
 141   decNumberFromString (&dn, string, &dc);       /* will round if needed */
 142   decimal64FromNumber (result, &dn, &dc);
 143   if (dc.status != 0)
 144     {                           /* something happened */
 145       decContextSetStatus (set, dc.status);     /* .. pass it on */
 146     }
 147   return result;
 148 }